EqualLogic Unidesk Technical Brief

8/12/2019 EqualLogic Unidesk Technical Brief

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Dell Desktop Virtualization Solutions (DVS) Technical Report

Overcoming the Storage Challenges ofPersistent Virtual Desktops with Dell

EqualLogic Hybrid Arrays and Unidesk

ABSTRACT

The ability of Dell EqualLogic hybrid arrays toautomatically tier data between SSD and SAS makesthese hybrid arrays a very cost-effective option formeeting the persistent virtual desktop

requirements for IOPS, as well as for disk spacerequirements when used in conjunction withUnidesk VDI management software. This technicalreport provides a proof point for how Unideskdesktop layering technology and Dell EqualLogichybrid arrays combine to increase user density andreduce storage cost per user, based on testingperformed in Dell Desktop Virtualization Solutions(DVS) Labs.


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Copyright 2012 Dell Inc. All Rights Reserved.

Dell EqualLogic is a trademark of Dell Inc.

All trademarks and registered trademarks mentioned herein are the property of their respective

owners.

Possession, use, or copying of the documentation or the software described in this publication isauthorized only under the license agreement specified herein.

Dell, Inc. will not be held liable for technical or editorial errors or omissions contained herein.The information in this document is subject to change.


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PREFACE

Dell Desktop Virtualization Solutions (DVS) Enterprise Infrastructure Overview:

DVS Enterprise Infrastructure is designed and optimized to deliver a highly robust, highly scalable andhighly available enterprise solution designed for implementations in sophisticated IT environments. The

DVS Enterprise infrastructure implements enterprise scale virtualized servers, multi-tier virtual SAN

storage and robust enterprise network architecture for multiple demanding use cases requiring

enterprise scaling, redundancy, high density, and sophisticated management of all system components.

It has been designed to scale from 50 to 50,000 users.

Dell EqualLogic Overview:

Dell EqualLogic PS Series arrays are intelligent storage arrays that are designed to provide simple

management and seamless expansion using innovative Dell Fluid Data technology. All PS Series storage

arrays include SAN configuration features and capabilities that sense network connections,

automatically build RAID sets, and conduct system health checks to help ensure that all components are

fully functional.

EqualLogic PS Series arrays are based on a virtualized modular storage architecture that enables IT

managers to purchase only the storage they needwhen they need itto help prevent both

underutilization and over-provisioning. Using innovative Fluid Data technology, all EqualLogic PS Series

arrays in a SAN work together to automatically manage data, load balance across all resources, and

expand to meet growing storage needs.

Unidesk VDI Management Software

Unidesk, a strategic Dell partner, is offered by Dell as a validated virtual desktop management option for

Dell Desktop Virtualization Solutions (DVS) Enterprise Infrastructure and DVS Virtual Labs. By replacing

block-based cloning, image management, application virtualization, and profile management point tools

with a more complete, unified solution, Unidesk makes it easier for IT organizations to package and

deliver applications, and create, patch, and support fully personalized desktops hosted on VMware

vSphere. Unidesks patent-pending desktop layering technology integrates with Citrix XenDesktop,

VMware View, and other brokering solutions to enable enterprises to expand VDI to more users,

reduce desktop operations costs up and cutting VDI storage capacity upwards of 70%.


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TABLE OF CONTENTS

PREFACE ....................................................................................................................................................... iii

TABLE OF CONTENTS .................................................................................................................................... iv

Executive Summary ....................................................................................................................................... 1

Key Findings .................................................................................................................................................. 2

Introduction .................................................................................................................................................. 3

The Challenges of Persistent Virtual Desktops ............................................................................................. 4

Storage Capacity Requirements for VDI ....................................................................................................... 4

Storage IOPS Requirements for VDI .............................................................................................................. 5

Dell EqualLogic Hybrid Arrays Solve the VDI IOPS Problem .......................................................................... 5

Unidesk VDI Management Software Solves the VDI Capacity Problem ....................................................... 6

More Benefits of Combining Dell Hybrid Arrays with Unidesk ..................................................................... 7

Test Configuration and Tools ........................................................................................................................ 8

Testing Method ............................................................................................................................................. 9

Storage Analysis and Results....................................................................................................................... 10

Storage Performance Analysis .................................................................................................................... 11

Conclusion: Combining Dell EqualLogic Hybrid Arrays with Unidesk Maximizes IOPS and Minimizes

Capacity When Deploying a Dell DVS Enterprise Infrastructure Solution .................................................. 12


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Executive Summary

Dells Desktop Virtualization Solutions (DVS) offer a full portfolio of end-to-end solutions that are

designed to help a wide range of IT organizations implement virtual desktop infrastructures- from the

device to the datacenter to the cloud. DVS is designed to ease design and implementation complexities

and address each organizations unique business, user, and IT requirements. By accelerating adoption of

desktop virtualization, organizations can adapt to the dynamics of todays more mobile and global

workforce and take advantage of the consumerization of IT, while enhancing security, IT flexibility, and

business continuity. The innovative DVS approach integrates purpose-built hardware, software, and

services to deliver innovative and flexible end user computing solutions to customers via a single source-

Dell.

One of the biggest barriers to widespread desktop virtualization adoption has been storage.

Implementing virtual desktops at any scale quickly becomes cost-prohibitive if you thick-provision every

desktop with a full-sized disk image. Image sharing and de-duplication technologies can reduce the

amount of required storage capacity and provide higher levels of cache hits and reusable blocks, but the

sheer magnitude of desktop IO, the higher percentage of write IO compared to read IO, and the random,

bursty IO patterns of desktop workloads force administrators to add spindles back, offsetting capacity

savings.

Because of these challenges, many early adopters have seen their VDI projects stall or fail. They either

exhaust their capital budgets paying too much for storage, or they do not take into account the IO

requirements of their desktop use cases, resulting in an unacceptable user experience. It is therefore

critical for those planning and implementing VDI to understand both storage capacity and performance

requirements, particularly IOPS, and account for both with the equipment and software solutions they

select.

It is also critical to understand use cases. Implementing non-persistent desktops that use cloning

technology to reduce the storage footprint may satisfy task workers who will accept a desktop that is

basically the same as everyone elses. Knowledge workers, however, typically require a persistent

desktop that gives them a modern, customizable experience.

Unidesk, a strategic Dell partner for DVS management, helps solve the use case, storage, and

management challenges with its desktop layering technology. Unidesk creates persistent desktops on

the same small storage footprint that cloned image technology can only use for non-persistent desktops.

Because the desktops are persistent, they sustain all user changes, including user-installed applications,

making knowledge workers happy. Unidesk also offers simpler, more robust image management and

application delivery capabilities than the combination of provisioning, application virtualization, and

profile management tools. The Dell DVS group recently conducted a series of tests using Unidesk in a

VMware View deployment to quantify the storage benefits of desktop layering.


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The test results confirm that the combination of Dell EqualLogic hybrid arrays and Unidesk are

exceptionally well-suited for VDI environments, and provide an ideal capacity/performance balance that

offers unparalleled user density.

Specifically, Dell EqualLogic hybrid SAN arrays enhance the performance and efficiency of VDI

deployments by combining SSD and SAS drives within a single chassis. The EqualLogic firmware providesautomatic tiering and balancing of stored data between the SSD and SAS tiers to provide more IOPS at

less cost. Unidesk desktop layering technology enables the Dell EqualLogic hybrid arrays to deliver the

same IO performance on less than half the capacity footprint of standard persistent virtual desktops.

Unidesk persistent virtual desktops share the same operating system and application layers, reducing

the storage footprint upwards of 70% compared to full desktop clones, and providing storage savings

similar to non-persistent shared image technologies. Unidesk desktops creates an optimal data pattern

that effectively exploits the automated tiering of Dell EqualLogic hybrid arrays, such that hot blocks are

stored on SSD, and less frequently accessed data is migrated to SAS. The result is more IOPS delivered

on a smaller storage footprint for greater user density and much lower storage cost/user.

Key Findings

Our testing showed remarkable synergy between Unidesk VDI management software and Dell

EqualLogic hybrid storage arrays for overcoming VDI capacity, IOPS, and cost challenges. Unidesk

desktop layering technology shares a single layer of the Operating System (OS) and common

applications such as Microsoft Office across many virtual desktops to significantly reduce VDI capacity

requirements. This same sharing of OS and application layers makes it easy for Dell EqualLogic hybrid

arrays to identify hot blocks, and store the commonly accessed OS and application files on its faster SSD

drives. The result is extremely low latency for both read and write operations, enabling you to host

many more virtual desktops on a single array and still deliver enough IOPS to provide a high

performance user experience. The increased user density makes Dell EqualLogic hybrid arrays a much

more cost-effective solution for VDI than all-SSD arrays or standard SAN arrays.

Compared to providing an identical user experience with thick-provisioned full clones,, the increased

desktop density provided by Unidesk significantly reduces storage deployment costs, as shown in the

following chart depicting Dell EqualLogic PS Series hybrid arrays in both deployment scenarios.


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Figure 1 Comparison of How Many Dell EqualLogic PS6010XVS Arrays are required

to Host Virtual Desktops With and Without Unidesk VDI Management Software

As the remainder of this white paper will show, combining Unidesk with Dell EqualLogic hybrid arrays

maximizes array performance to solve the VDI IOPS problem, and reduces the storage footprint upwards

of 70% to increase user density greater than 3x compared to full clones on Dell EqualLogic hybrid arrays.

Introduction

Striking the right balance between storage capacity, IOPS, and cost is one of the most difficult challenges

when implementing Virtual Desktop Infrastructure (VDI). The use of traditional SAN storage typically

requires capacity to be over-provisioned to meet the IOPS requirements of virtual desktop workloads.

The use of high-cost, low-latency solid state drives (SSDs) can deliver sufficient IOPS on a smaller storage

footprint, but capacity ends up being under-provisioned, and the cost to add more SSD quickly becomes

prohibitive.

Dell EqualLogic PS Series hybrid arrays and Unidesk VDI management software combine to provide an

optimal balance between storage capacity, IOPS, and cost for organizations that require persistent

desktops capable of sustaining all user customizations.

During the development of this paper, Dell DVS performed a significant amount of testing using Dell

hardware, VMware vSphere and VMware View, and Unidesk VDI management software. We found that

Unidesk desktop layering technology provisioned virtual desktops on VMware vSphere that used up to

0

2

4

6

8

10

12

0

5

10

15

20

25

100 200 300 400 500 600 700 800 900 1000

#ofXVSarrays

Diskcapacity(TB)

# of virtual desktops

Unidesk reduces storage capacity by over 70%

Full Clone Unidesk Clone


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70% less storage compared to thick-provisioned persistent desktops, significantly increasing user density

on the Dell EqualLogic hybrid array. The array was able to deliver more than enough IOPS on this

smaller storage footprint to provide a high-performance user experience, resulting in a much lower

storage cost per user compared to traditional SAN storage.

Figure 2 The Simple VDI Stack Enabled by the Combination of

Dell EqualLogic Hybrid Arrays, Dell PowerEdge Servers, VMware, and Unidesk

The Challenges of Persistent Virtual Desktops

When persistent virtual desktops are required to meet the desktop customization needs of knowledge

workers, many organizations provision full VMware clones, where every desktop is created with a full-

sized operating system and applications built into the gold image. This increases storage capacity

requirements, and makes managing, patching, and updating the virtual desktops no easier than

traditional PCs, negating many of the operational efficiencies and cost savings expected from VDI.

However, capacity isnt the real challenge when it comes to dealing with the high cost of VDI storage.Even if you bought enough SAN capacity to thick-provision full desktop clones, you still wouldnt be able

to deliver enough IOPS to give end users a satisfactory virtual desktop experience.

Storage Capacity Requirements for VDI

Lets take a look at a typical VDI use case where an organization needs to support 500 persistent virtual

desktops using Microsoft Windows 7.


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Figure 3 VDI IOPS Requirement for 500 Virtual Desktops

Based on Read/Write Ratios

Figure 4 VDI IOPS Analysis for 500 Virtual Desktops

Creating standard full clones would require about 20 GB of storage per desktop to account for Windows

itself, standard applications, and space for user data and user installed applications. Multiply 20 GB by

500 desktops, and you would require approximately 10 TB of disk space. Using 450GB SAS drives and a

RAID5 configuration, you would need 25 drives to deliver the 10 TB of standard SAN storage required by

the 500 virtual desktops.

Storage IOPS Requirements for VDI

Now lets take a look at the same VDI use case from an IOPS perspective.

Figure 3 offers an estimated IOPS breakdown for 500 desktops. Using 10 IOPS per virtual desktop

requires 5000 IOPS to support 500 desktops, not accounting for storm conditions where IOPS increase

significantly; assuming a 30/70 split between read and write IOPS.

Supporting 5,000 IOPS with 450GB 15K SAS drives would require 60 drives configured in RAID 5. Caching

can reduce the drive numbers, but only slightly given that desktops have heavy write loads, and that full

desktop clones will not make the read blocks hot enough to store them in the cache.

IOPS/VM VMs Total IOPS

Read 3 500 1500

Write 7 500 3500

Total IOPS 5000

As you can see, IOPS is the problem, not capacity. Only 25 drives are required to deliver enough usable

storage capacity for the 500 desktops, but 60 drives are required to deliver sufficient IOPS.

HDD

QTY

HDD

IOPS

Raw

IOPS

Write % Subtotal Penalty Write

IOPS

read % Read

IOPS

Usable

IOPS

60 180 10800 0.7 7560 4.0 1890 0.3 3240 5130

Dell EqualLogic Hybrid Arrays Solve the VDI IOPS Problem

The Dell EqualLogic PS Series hybrid arrays are designed to support fast access to high demand hot

data in multi-tiered datasets. The Dell EqualLogic PS6010XVS hybrid array has 16 drives 8 high

performance SSD drives and 8 high capacity 15,000 rpm Serial Attached SCSI (SAS) hard disk drives. The

on-board intelligence of the EqualLogic firmware provides automatic tiering between the two drive


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6Figure 6 Unidesk Desktop Layering Offers the

Customizable Desktop Experience of Persistent VDI

and the Storage Efficiency and Single ImageManagement of Non-Persistent VDI

types SSD and SAS, as well as automatic load balancing across multiple drives of each type, helping

deliver the appropriate balance of responsiveness and capacity for virtual desktop workloads. The

arrays use dynamic data placement algorithms to move hot data to the SSD drives from SAS drives and

move cold or warm data from the SSD drives out to the SAS drives as needed.

Figure 5 Automatic Tiering with Dell EqualLogic PS6010XVS

The 8 SSD drives and 8 SAS drives in the hybrid arrays provided sufficient IOPS to support the

requirements of 500 virtual desktops.

However, capacity for persistent desktops is a challenge for the Dell EqualLogic PS6010XVS array, as it

delivers 4.4 TB of raw storage capacity. Using RAID6, approximately 2.5 TB of storage capacity remains

usable. So although the Dell EqualLogic PS6010XVS provides sufficient IOPS needed by the 500

desktops, the 2.5TB of usable capacity falls short of the 10 TB of usable storage capacity required by the

500 full-sized virtual desktops.

This is where using Unidesk in conjunction with Dell EqualLogic hybrid arrays is the ideal combination to

solve both the IOPS and capacity challenges that have been holding VDI back.

Unidesk VDI Management Software Solves the VDI Capacity Problem

Unidesk VDI management software creates persistent desktops on VMware infrastructure that sustain

all user customizations, while delivering the storage savings and single image management benefits of

non-persistent desktops.

As shown in Figure 6, Unidesk enables

desktops to be managed as sets ofdiscrete, reusable layers. Every

desktop has a personalization layer that

sustains all user customizations, from

simple profile settings to user-installed

applications and plug-ins, enabling IT to

implement VDI for more use cases.


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Figure 7 Unidesk Shares the Same OS and Application

layers across many virtual desktops to reduce VDI disk

space requirements up to 70%

However, administrators need only patch and manage a single set of shared application and OS layers

for all desktops to dramatically reduce OpEx.

As Figure 7 shows, Unidesks ability to share the same OS and application layers across many virtual

desktops reduces the disk space capacity required for persistent desktop use cases by upward of 70%.

Lets look at how Unidesk layer sharing

impacts our 500 desktop VDI example

from a capacity standpoint. By sharing

a single copy of Windows 7 and

standard applications across many

virtual desktops, you would only need

to design for approximately 5 GB ofstorage per desktop as follows:

2.5 GB for the boot drive

1 GB for desktop storage (user

settings and user-installed

applications)

1 GB for shared applications

.5 GB for desktop repair

snapshots

Multiplying 5GB by the 500 desktops and 2.5 TB of usable storage capacity is required with Unidesk for

the 500 desktops, a 70% reduction compared to the full-sized clones.

Since each Dell EqualLogic hybrid array can deliver 2.5 TB of usable capacity, you would only need 1

array to meet the storage capacity requirements of the 500 desktops provisioned and managed by

Unidesk. And since only 1 array is required to meet the IOPS requirements as well, youve now reduced

your VDI storage costs from 4 arrays to 1 array.

More Benefits of Combining Dell Hybrid Arrays with Unidesk

Unidesks layer sharing also creates a data pattern that makes good use of the intelligent data tieringcapabilities of Dell EqualLogic PS Series hybrid arrays. When a Unidesk application or OS layer is

assigned to one or more desktops, the desktops directly read that layer without copying or duplicating

the data. This enables the array to easily identify those layers as hot and retain them on SSD, while

pushing the rarely accessed desktop content to SAS.

The most-used blocks from the OS layer remain on the low-latency SSD drives, which is especially

beneficial for writes given they generally make up 70% of VDI payload. If Unidesk was not used, then


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the OS blocks would be spread out and too infrequently used to be recognized as hot, resulting in

increased latency and lower performance, as our testing showed.

Using Dell hybrid arrays in tandem with Unidesk also offers data center space management advantages

and significant savings in power and cooling as well. Instead of needing many shelves of 15K drives, only

1 hybrid array is needed, with a power footprint of a single shelf.

Test Configuration and Tools

To prove that you can increase user density and still deliver plenty of IOPS by provisioning storage-

efficient desktops with Unidesk on Dell EqualLogic hybrid arrays, Dell DVS built a test environment

consisting of Dell servers, a Dell EqualLogic PS Series hybrid array, VMware vSphere virtual

infrastructure, VMware View connection brokering software, Unidesk VDI management software, and a

variety of applications, as shown in Figure 9.

Figure 8 Test Lab Configuration for Comparing Capacity and IOPS of

Unidesk Layered Desktops versus Standard Full Clone Desktops


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Figure 9Login VSI Medium Workload

Characteristics

Testing Method

In order to create a valid apples-to-apples comparison VMware View 4.6 was tested first to establish

the baseline. Unidesk was then integrated into the View environment and tested. All testing was

conducted under load usingLogin Consultants Login VSI Proa benchmarking tool used to measure and

report on the performance and scalability of VDI environments.

Login VSI Pro uses Launcher virtual machines (VMs) that open VMware View sessions to the virtual

desktops and execute a set of tests. Upon completion, EqualLogic SANHQ was used to assess storage

performance. SANHQ provides centralized monitoring, historical performance trending, and event

reporting for EqualLogic PS Series storage.

The Login VSI Pro Medium work load was used to simulate what is typically referred to as a

Knowledge Worker. Details of this workload are in the following table.

Login VSI Medium Workload Characteristics

Emulates a medium knowledge worker using Office 2010, IE9, PDF and Flash.Once a session has been started the medium workload will repeat every 12 minutes.

During each loop the response time is measured every 2 minutes

The medium workload opens up to 5 apps simultaneously.

The type rate is 160ms for each character

Approximately 2 minutes of idle time is included to simulate real-world users.

Each loop will open and use:

Outlook 2010, browse 10 messages.

Internet Explorer 9, one instance is left open (BBC.co.uk), one instance is browsed to Wired.com,

Lonelyplanet.com and heavy Flash app gettheglass.com

Word 2010, one instance to measure response time, one instance to review and edit document

Bullzip PDF Printer & Acrobat Reader, the word document is printed and reviewed to PDF.

Excel 2010, a very large randomized sheet is opened.

PowerPoint 2010, a presentation is reviewed and edited.

7-zip: using the command line version the output of the session is zipped.

The Windows 7 master image for the VMware View testing was 21GB. With a capacity use target of 90%

of the EqualLogic array, 107 persistent virtual desktops were deployed. While 3 additional desktops

could have been deployed across LUNs 2, 3 and 4, it was decided against bringing the LUNs to within 1%

of capacity to avoid possible performance implications that might affect results.
http://www.loginvsi.com/http://www.loginvsi.com/http://www.loginvsi.com/http://www.loginvsi.com/


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The 107 full VMware View Windows 7 virtual desktops were then tested under load.

After the VMware View testing was complete, Unidesk was deployed into the environment and tested

under identically configured load in the following test scenarios:

1. 107 Unidesk provisioned virtual desktops to contrast directly with the aforementioned

VMware View testing.

2. 361 Unidesk provisioned virtual desktops to produce greater than 3x-to-VMware View

comparison

Storage Analysis and Results

The results verified that Unidesk desktops performed as well as the thick provisioned, full-sized clones

when both were run on the Dell EqualLogic hybrid arrays. As expected, however, the Unidesk provided

a much higher virtual desktop density on the same EqualLogic PS Series array without sacrificing

performance.

Note: Because this testing is based on simulation, and not real life desktop use, the number of

desktops you will be able to support on a single Dell EqualLogic hybrid array may be more or less in your

environment. TheMedium simulation may actually be more demanding than normal desktop use, sinceusers are not all active at the same time. The best way to determine the IO requirements in your

environment is to perform an assessment of all or a subset of your desktops.

The following set of charts represents the VMware View test and is used as the baseline for subsequent

analysis of the Unidesk tests. Note that while the capacity of the array is consumed, the IOPS are well

below the capabilities of the array at 8000+ IOPS.


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Figure 10 Storage Results of 107 VMware View virtual desktops under Simulated Desktop Load

Storage Performance Analysis

As the next chart shows, the performance of over 3x the number of Unidesk virtual desktops required a

little over 3x the IOPS, which is expected. However, while Average Write Latency is excellent in both

cases, Unidesk desktops show a significantly lower Average Read Latency especially when considering

there are 3x as many virtual desktops running under load, compared to the full VMware View desktops.

This is due to the Unidesk CacheCloud architecture sharing common OS and application layers across

many virtual desktops. The Dell EqualLogic array sees the blocks from these shared layers as hot and

stores them on its low-latency SSD drives for improved IO read performance.


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Figure 11 Storage Results of 361 Unidesk virtual desktops under Simulated Desktop Load

Conclusion: Combining Dell EqualLogic Hybrid Arrays with Unidesk

Maximizes IOPS and Minimizes Capacity When Deploying a Dell DVS

Enterprise Infrastructure Solution

In this paper we have discussed the challenges that result from trying to implement persistent virtual

desktops for the large percentage of knowledge workers who require a modern, customizable desktop

experience. Provisioning full-sized desktop clones on standard SAN storage requires costly storage

capacity that is still insufficient to address desktop IOPS requirements. Using advanced, high-performance hybrid arrays like Dell EqualLogic PS6010XVS that use SAS and SSD in the same chassis

deliver enough IOPS, but then capacity can become the bottleneck.

Our tests have shown that combining Unidesk VDI Management software with a Dell DVS Enterprise

Infrastructure integrated solution stack featuring Dell EqualLogic PS6010XVS hybrid array solves both

the capacity and IOPS problems at a greatly reduced cost, while also simplifying VDI image management,

application packaging, and persona management. Unidesk layering technology reduces the storage

footprint up to 70% compared to full desktop clones, and creates a hot data pattern that optimizes

the automated tiering of Dell EqualLogic PS6010XVS hybrid array, so that hot blocks are stored on SSD,

and less frequently accessed data is migrated to SAS. The result is more IOPS delivered on a smallerstorage footprint for greater user density and much lower storage cost/user.


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Product Information

Information about Dell EqualLogic hybrid SAN arrays can be found athttp://www.equallogic.com

Information about Unidesk VDI Management software can be found athttp://www.unidesk.com,or by

contacting your local Dell sales representative. To learn more about Dells Desktop Virtualization

Solutions (DVS), please visithttp://www.dell.com/virtualdesktops. Dell and Unidesk Corporation havepartnered to make Unidesk VDI Management software available for purchase through Dell Software &

Peripherals. For more information around the value of DVS and Unidesk, please visit

http://www.unidesk.com/dell.

Technical Support and Customer Service

Dell's support service is available to answer your questions about PS Series SAN arrays. If you have an

Express Service Code, have it ready when you call. The code helps Dell's automated-support telephone

system direct your call more efficiently.

Contacting Dell

Dell provides several online and telephone-based support and service options. Availability varies by

country and product, and some services might not be available in your area.

For customers in the United States, call 800-945-3355.

Note: If you do not have access to an Internet connection, contact information is printed on your

invoice, packing slip, bill, or Dell product catalog.

Use the following procedure to contact Dell for sales, technical support, or customer service issues:

1. Visit support.dell.com or the Dell support URL specified in information provided with the Dell

product.

2. Select your locale. Use the locale menu or click on the link that specifies your country or region.

3. Select the required service. Click the "Contact Us" link, or select the Dell support service from the list

of services provided.

4. Choose your preferred method of contacting Dell support, such as e-mail or telephone.

Online Services

You can learn about Dell products and services using the following procedure:

1. Visit www.dell.com (or the URL specified in any Dell product information).

2. Use the locale menu or click on the link that specifies your country or region.
http://www.equallogic.com/http://www.equallogic.com/http://www.equallogic.com/http://www.unidesk.com/http://www.unidesk.com/http://www.unidesk.com/http://www.dell.com/virtualdesktopshttp://www.dell.com/virtualdesktopshttp://www.dell.com/virtualdesktopshttp://www.unidesk.com/dellhttp://www.unidesk.com/dellhttp://www.unidesk.com/dellhttp://www.dell.com/virtualdesktopshttp://www.unidesk.com/http://www.equallogic.com/

EqualLogic Unidesk Technical Brief

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